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About 3.2 billion people, nearly half the world population, are at risk for malaria. In 2015, there are about 214 million malaria cases and an estimated 438,000 malaria deaths.
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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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There are more nerve cells in one human brain than there are stars in the Milky Way.
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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%